| Harpenden to Coswig | 545.01 mi (877.11 km) |
| Harpenden to Cottbus | 626.63 mi (1,008.46 km) |
| Harpenden to Crailsheim | 493.82 mi (794.72 km) |
| Harpenden to Cremlingen | 468.35 mi (753.73 km) |
| Harpenden to Crimmitschau | 553.74 mi (891.16 km) |
| Harpenden to Cuxhaven | 402.76 mi (648.19 km) |
| Harpenden to Dachau | 577.02 mi (928.63 km) |
| Harpenden to Dallgow-Doberitz | 569.20 mi (916.03 km) |
| Harpenden to Damme | 365.39 mi (588.04 km) |
| Harpenden to Darmstadt | 414.90 mi (667.71 km) |
| Harpenden to Dassel | 428.67 mi (689.87 km) |
| Harpenden to Datteln | 329.26 mi (529.90 km) |
| Harpenden to Dautphe | 389.68 mi (627.13 km) |
| Harpenden to Deggendorf | 621.57 mi (1,000.32 km) |
| Harpenden to Delbruck | 380.94 mi (613.06 km) |
